Brake drum



V. BENDIX May 13, 1930.

BRAKE DRUM Filed June 2, 1927 INVENTOR CENT BENmx VIN BY 'ATTORNEYPatented May 13, 1930 i UNITED STATES PATENT OFFICE vmcmrr nnnmx, orCHICAGO, ILLINOIS,

AssIsIvoBY T BENDIX BRAKE COMPANY,

OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS BRAKE Application filedJune 2, 1927. I serial No 195,995.

' edge flange and which forms a very close The above and joint with theedge of the backing plate flange.

This provides two close joints at right angles to each other, forming ineffect a battle which effectually prevents the passage of mud, water,etc. 7

other objects and features of the invention, including various novel anddesirable features ofconstruction, will be apparent from the followingdescription of one illustrative embodiment shown in the ac'com-. panyingdrawing, in which:

Figure 1 is a side elevation of the drum and backing plate, partlybroken away in. radial section; an

Figure 2 is a section similar to Figure 1 indicating a modified form ofdrum and backingiplate assembly.

The drum isillustrated as drawn or pressed from sheet steel, with a head10 and a cylindrical braking portion 12- with the inside of which thebrake shoes (not shown) are engaieable. v

t the edge of the braking portion 12, the drum is formed with anoutwardly-extending edge flange 14, which is relatively short,and'

' 'which is closely encircled by a part 16, (preferably an integral edgeflange) of a backing late 18, thus forming one very tight joint, etweenthe drum and the backing plate] 7 v The drum is also provided with apart, preferably a separate'flatring 20 shrunk on portion 12 andarc-welded or otherwise secured "rected flange at its new thereto, andwhich forms an outwardly-extendin rib adjacent the flange 14:. Ring 20may, if desired, be formed with a cylindrical base flange or hoop,encircling and preferably spot-welded to the drum. Part 20 projectsoutwardly further than flange 14, and crosses theendof the backing plateflange 16, i. e. the backing plate flange terminates immediatelyadjacent the side of ring 20,-thus forming a second very close jointbetween the drum and backing plate.- The ring also serves the importantfunctions of reinforcing the drum and of aiding in the radiation ofheat.

It will be seen that the two joints are at right angles to each other,thus. forming a bafiie which .eifectually excludes mud and water. 1

While one illustrative embodiment has been described in detail, it isnotmy intention to limit the scope of the invention to that particularembodiment 'br otherwise than by the terms of the appended I claimclaims,

1. A brake drum having a cylindrical braking portion formed with anoutwardly-di-' rected flange at'its edge and having a part encirclingsaid portion and forming a rib adjacent said flange, in combination witha backing plate having at its outer edge an integral flange encirclingsaid flange of the brake drum andterminating immediately adjacent theside face of said rib.

2. A brake drum having a cylindrical braking portion formed with anoutwardly-diedge and having a separate ring 'encircling said portion andforming a rib-adjacent said flange, in combination with a backing platehaving at its outer edge a part encircling said flange of the brake drumand terminating immediately adjacent the side face ofsaid rib.

- 3. A brake drum having a cylindrical brak with a relatively shortcircling said portion immediately adjacent said flange and projectingoutwardly further than said flange. 4. A brake drum having a cylindricalbrak- 5 ing portion formed With-a relatively short integraloutwardly-extending flange at'its edge, a and having a separate flatbafiie ring encircling and welded at its inside edge to said portionimmediately adjacent said flange and m projecting outwardly further thansaid flange. v

In testimony whereof, I have hereunto signed my name.

' VINCENT BENDIX.

